This paper demonstrates the possibility of efficient adiabatic nano-focusing of plasmons by a sharp triangular metal wedge. Geometrical optics approach and the approximation of continuous electrodynamics are used for the analysis. In particular, it is demonstrated that both the phase and group velocities of an incident anti-symmetric (with respect to the magnetic field) plasmon tend to zero at ...

We describe a novel robotic endoscope system. It can be used to observe a wide area without moving or bending the endoscope. The system consists of a laparoscope with zoom facility and two wedge prisms at the tip. This new concept produces excellent characteristics as follows. Firstly, it can change the field of view even in a small space. Secondly, it is safe because it avoids the possibility ...

What is the minimum angle α > 0 such that given any set of α-directional antennas (that is, antennas each of which can communicate along a wedge of angle α), one can always assign a direction to each antenna such that the resulting communication graph is connected? Here two antennas are connected by an edge if and only if each lies in the wedge assigned to the other. This problem was recently p...

The problem of steady two-dimensional boundary layer flow momentum, heat and mass transfer over a stretching permeable wedge-shaped surface in nanofluid presence magnetic field has been studied. In this respect, the governing partial differential equations have converted into ordinary by using local similarity transformation. transformed then solved numerically bvp4c MATLAB software. effects pe...

fixed angle θ with the direction of gravity. Rotational actuation of the edges around their fixed intersection point is used to stabilize one particular orbit of the uncontrolled system. When uncontrolled, the wedge billiard is a rich dynamical model leading to stabilization problems of various complexity. It was realized in [2], [6] that the wedge billiard displays a variety of dynamical pheno...

This paper proposes a novel generalized total-field/scattered-field (G-TF/SF) formulation for finite-difference time-domain (FDTD) to efficiently model an infinite material scatterer illuminated by an arbitrarily oriented plane wave within a compact FDTD grid. This requires the sourcing of numerical plane waves traveling into, or originating from, the perfectly matched layer (PML) absorber boun...

Detonation of the flow of a combustible mixture over a wedged channel is numerically simulated. A two-dimensional, time accurate, finite-volume-based method is used to perform the computations, and a five-species, two-step chemical reaction is assumed for a stoichiometric hydrogen-air mixture. The combustion channel is made of a wedged section followed by a constant area section. The simulation...

Purpose: Static wedge filters (WF) are commonly used in radiation therapy, forward and/or inverse planning. We calculated the exact 2D/3D geometrical pathway of the photon-beam through the usual alloy WF, in order to get a better dose related to the beam intensity attenuation factor(s), after the beam has passed through the WF. The objective was to provide general formulation into the Anisotrop...

Background To determine the relationship between superior disc-endplate complex injury and correction loss after surgery in a group of young adult patients with a stable thoracolumbar burst fracture. Methods The study group was comprised of young adult patients who had undergone short-segment posterior fixation and bone grafting under the diagnosis of a stable thoracolumbar burst fracture fro...

Background: Iliac osteotomies in adolescent patients may accompany graft related difficulties such as graft absorptionand delayed union. A new modification of iliac osteotomies has been proposed to address these difficulties.Methods: A total of 24 consecutive hip joints in 21 juvenile or adolescent patients who were candidate for salter ortriple pelvic osteotomy were included....